南非采购需求：太阳能电池板、太阳能系统、锂离子电池、太阳能逆变器、便携式电站、磷酸铁锂电池

I'm looking to place an order for 400 units of 550W panels, specifically with black frames. Additionally, I would like to source another 400 units of the same panel type but with silver frames. Please provide the pricing, lead time, and availability for both versions. It would also be helpful if you could send over details about warranties or specifications for these panels. If there are any minimum order quantities or bulk discounts available, please include that information as well. Looking forward to your prompt response with the required details!